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180 lines
5.9 KiB
180 lines
5.9 KiB
/*
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* Copyright (c) 2016 - 2019, Nordic Semiconductor ASA
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef NRF_SYSTICK_H__
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#define NRF_SYSTICK_H__
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#include <nrfx.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @defgroup nrf_systick_hal SYSTICK HAL
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* @{
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* @ingroup nrf_systick
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* @brief Hardware access layer (HAL) for managing the SYSTICK peripheral.
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*
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* SYSTICK is a peripheral designed by ARM.
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* This means that it does not feature the typical Nordic interface with Tasks and Events.
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*
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* Its usage is limited here to the implementation of simple delays.
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* Moreover, keep in mind that this timer will be stopped when CPU is sleeping
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* (WFE/WFI instruction is successfully executed).
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*/
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/**
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* @brief Mask of usable bits in the SysTick value.
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*/
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#define NRF_SYSTICK_VAL_MASK SysTick_VAL_CURRENT_Msk
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/**
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* @brief Flags used by SysTick configuration.
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*
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* @sa nrf_systick_csr_set
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* @sa nrf_systick_csr_get
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*/
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typedef enum {
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NRF_SYSTICK_CSR_COUNTFLAG_MASK = SysTick_CTRL_COUNTFLAG_Msk, /**< Status flag: Returns 1 if timer counted to 0 since the last read of this register. */
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NRF_SYSTICK_CSR_CLKSOURCE_MASK = SysTick_CTRL_CLKSOURCE_Msk, /**< Configuration bit: Select the SysTick clock source. */
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NRF_SYSTICK_CSR_CLKSOURCE_REF = 0U << SysTick_CTRL_CLKSOURCE_Pos, /**< Configuration value: Select reference clock. */
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NRF_SYSTICK_CSR_CLKSOURCE_CPU = 1U << SysTick_CTRL_CLKSOURCE_Pos, /**< Configuration value: Select CPU clock. */
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NRF_SYSTICK_CSR_TICKINT_MASK = SysTick_CTRL_TICKINT_Msk, /**< Configuration bit: Enables SysTick exception request. */
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NRF_SYSTICK_CSR_TICKINT_ENABLE = 1U << SysTick_CTRL_TICKINT_Pos, /**< Configuration value: Counting down to zero does not assert the SysTick exception request. */
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NRF_SYSTICK_CSR_TICKINT_DISABLE = 0U << SysTick_CTRL_TICKINT_Pos, /**< Configuration value: Counting down to zero to asserts the SysTick exception request. */
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NRF_SYSTICK_CSR_ENABLE_MASK = SysTick_CTRL_ENABLE_Msk, /**< Configuration bit: Enable the SysTick timer. */
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NRF_SYSTICK_CSR_ENABLE = 1U << SysTick_CTRL_ENABLE_Pos, /**< Configuration value: Counter enabled. */
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NRF_SYSTICK_CSR_DISABLE = 0U << SysTick_CTRL_ENABLE_Pos /**< Configuration value: Counter disabled. */
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} nrf_systick_csr_flags_t;
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/**
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* @brief Function for getting Configuration and Status Register.
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*
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* @note The @ref NRF_SYSTICK_CSR_COUNTFLAG_MASK value is cleared when CSR register is read.
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* @return Values composed by @ref nrf_systick_csr_flags_t.
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*/
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__STATIC_INLINE uint32_t nrf_systick_csr_get(void);
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/**
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* @brief Function for setting Configuration and Status Register.
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*
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* @param[in] val The value composed from @ref nrf_systick_csr_flags_t.
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*/
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__STATIC_INLINE void nrf_systick_csr_set(uint32_t val);
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/**
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* @brief Function for getting the current reload value.
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*
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* @return The reload register value.
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*/
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__STATIC_INLINE uint32_t nrf_systick_load_get(void);
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/**
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* @brief Function for configuring the reload value.
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*
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* @param[in] val The value to be set in the reload register.
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*/
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__STATIC_INLINE void nrf_systick_load_set(uint32_t val);
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/**
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* @brief Function for reading the SysTick current value.
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*
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* @return The current SysTick value
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* @sa NRF_SYSTICK_VAL_MASK
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*/
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__STATIC_INLINE uint32_t nrf_systick_val_get(void);
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/**
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* @brief Function for clearing the SysTick current value.
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*
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* @note The SysTick does not allow setting current value.
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* Any write to VAL register would clear the timer.
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*/
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__STATIC_INLINE void nrf_systick_val_clear(void);
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/**
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* @brief Function for reading the calibration register.
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*
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* @return The calibration register value.
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*/
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__STATIC_INLINE uint32_t nrf_systick_calib_get(void);
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#ifndef SUPPRESS_INLINE_IMPLEMENTATION
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__STATIC_INLINE uint32_t nrf_systick_csr_get(void)
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{
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return SysTick->CTRL;
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}
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__STATIC_INLINE void nrf_systick_csr_set(uint32_t val)
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{
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SysTick->CTRL = val;
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}
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__STATIC_INLINE uint32_t nrf_systick_load_get(void)
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{
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return SysTick->LOAD;
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}
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__STATIC_INLINE void nrf_systick_load_set(uint32_t val)
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{
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SysTick->LOAD = val;
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}
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__STATIC_INLINE uint32_t nrf_systick_val_get(void)
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{
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return SysTick->VAL;
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}
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__STATIC_INLINE void nrf_systick_val_clear(void)
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{
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SysTick->VAL = 0;
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}
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__STATIC_INLINE uint32_t nrf_systick_calib_get(void)
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{
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return SysTick->CALIB;
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}
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#endif /* SUPPRESS_INLINE_IMPLEMENTATION */
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/** @} */
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#ifdef __cplusplus
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}
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#endif
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#endif /* NRF_SYSTICK_H__ */
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